driver core: Create __fwnode_link_del() helper function

The same code is repeated in multiple locations. Create a helper
function for it.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20210915172808.620546-3-saravanak@google.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>